\subsection{Блок-схема}

\begin{figure}[ht]
\centering
\begin{tikzpicture}[node distance = 1cm, auto]
      \node [cloud] (start) {Начало};
      \node [print_block, below of = start] (out) {`Таких чисел нет.`};
      \node [cloud, below of = out] (finish) {Конец};
      
      \path [line] (start) -- (out);
      \path [line] (out) -- (finish);
\end{tikzpicture}
\end{figure}
